Pavement heater



I July 13 1926.

G. A. cQATs' PAVEMENT HEATER 'Filed March 21, 1925 INVENTOR: x4/M.

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Patented July 13, 1926.

U NITED STATES PATENT orties.

PAVEMENT HEATER.

Application tiled March 21, 1925.

The'object of my invention is to operate a pavement' heater bymountingthe necessary equipment upon a standard or conventional tractor,consisting,V of a suitable frame which supports the various coactingelements including a blower fan to blow tie heated air through thefurnace or combustion chamber onto the pavement to be heated, said fanbeingoperate'd by the power taken from what is kuownas the power takeolf ofthe tractor whichc'an be drivendirectly or from acountershaftconnection,l while in addition to the fan `bloweita fttelroilpump isalso operated from thesaine driving mechanism or source of power.

When it is necessary to moveV the heater from one location to another,when using the' power from the po ver take off, the action of disenggingthe clutchl and'changinggea'rs 'necessitates a slowing down or partialstoppage ofthe'iblofwingniember, which interferes with the' com-pletecombustion otherwise maintained in the` coi'nbustion chamber or furnace,and causes more or less smoke, which conditionI olwia'te byinserting'alsuitable valve' in the fuel line andronnectin'g it with thelever' used for raising'the hood in `such a manner, as to shut offordiminish the supply of' fue'l oil at the time of raising the hoodthereby preventing' imperfect combustion andthe production" of smokeduring'the'period of'changing gears 'or moving' th equipmentfronr onelocation to another. My no'vi'el collocation of the hood raisingmecl'ianisin, and the simultaneous control' ofthe fuelv 'supply to" thecombusti on chamber, results in" a" novel in'ecliai'iism wherein thefuel `su `pi}')'ly is automatically controlled b V the operator' withoutany attention on his part'simultan'eously with the ac"- tuationo'f thehoo'd, so that'v no noticeable quantity of 'smol'e or fumes escape fromthe hood when the' latteris raised' r dorme-the slii'ftin'g'of gears orthetransferral of the apparatus from one location to another.-r

To the-above ends my invention consists of the novel construction`ofhood' actuating mechanism,"'connected to thel control of the means'forx supplying fuel to fthe combustion clia'inber; 'in'such awaythat'the :fuel supply isjautom'atically controlled or reducedsimultaneously' with" the a elevation of the hood, whereby* thecreationof undue' smoke or. futiles" is ob`v'iated`,' during the'shifting of grsor moving'of the apparatus from one location"toanOtllIhSerial No. 17,195.

lt further consists of a novel construction of hood actuating mechanism,counterbalancingv devices therefor, and connections therefroni yto thevalve in the fuell line, whereby the latter is automatically actuatedsimultaneously with ther actuation of the hood. Y

It further consists of novel means for driving the fuel pump and blowerfrom the power take olf of the tractor.

It further consists of a novel detachable frame for atractor, adapted tocarry a pavement heater andV its adjuncts. A

It further consists of a novel' manner of actuating the hood ofthepavement heater and novel means for counteibalancing` the weightthereof. 4 v n ItV further consists of novelkfeatures of constructionand advantage all as will be hereinafter described-and pointedout in theclaims appended hereto.

.For the pfirpos'e of iillustrating` my invenl tion,' I have .showninthe accompanying drawings forms" thereof which are at presentpreferred by me, since they have been found in practice to givesatisfactory and reliable` results, although it isto be understood thatythe i' various ii'istrume'nta'lities of which'my invention consists canbe variously arrange'd'arid 'organized and'that my invention `isnotli'initejd to the.. precise arrangement and organit'ation'of theseinstrumen talities as herein shown andidesciibe'd.

Fig.l 1 represents a side .elevation of a pavement?` heater, and its adjuncts, embodying my invention.

Fig. 2l represen'ts'a di'agran'nnatie view'of the niechanisin drivenfrom the power take oil for drivingl the fuel pump and blower.

Similar'numerals of reference'indicate coresponding parts.

Referring' to the drawings :M

ln ca'rryii'lg out my inrentioin l'install upona com chtional orstandardtractor or siini'lar self-1n-opell`ed vehicle i, a novel supportingvfra'i'ne'Q, the same comprising` a U- shapcd member or beam 3,preferably of angular shape'in cross section, 'and compris4 ing theuprights', and the bottoin member 5; The frame 3 is placedvagainst thefront pendant portion 6V of the tractor, and sccured in position thebolt Y or the like, which passes through the plate 8,'and through thebifurcations' of the tractor frame'andl isv secure'd in lpositionby the'pin 10 or the'li'ke." The upper ends'ofthe uprights 4, are bolted,riveted or otherwise secured at 11 to the front ends of the upper beams12, which are oppositely arranged in parallelism and in the samehorizontal plane, said upper bean'is having the forward extension 13,which projects forwardly beyond the uprights 4, the front ends of saideX- tension 13 being tied together by the transverse front angularlplate or angle iron 14. 'lhe lower `beams 15 are composed of the lowerhorizontal portions 1G, which are continued to form the forwardlyupwardly inclined portions 17 whose upper ends are secured by welding orotherwise at the points 18 to the front bottom portionsY of the eX-tensions 13. The'rear portions of the beams 12 and 1G are joined andbraced by the uprights 19. whose bottom flanges or feet 20 are bolted orriveted to the top flanges 21 of the lower beams 15, while the upperends ofsaid uprights are welded or otherwise secured at the points 22 tothe rear ends of the upper beams 12. The gussets 23 may also beVemployed at the points seen in Figs. 1 and 3 to give further strengthand rigidity to the frame. 24 designatesthe top transverse brackets,which are suitably secured to the upper beams 12. The intermediateportion of the frame 2 is secured to the tractor body by the strapsorconnections 25, as will be understood from Fig. 1. The elongatedcombustion chamber 2G is supported on the transverse brackets 24, andits front end discharges into the conduit 27, which leads the hot gasesand products of combustion into the hood 28, which is supported by meansof the connections 29, whose upper ends are connected to the lower arms30 which are mounted on the shaft 32, which is provided with the upperarm 31. The counterbalancing spring 33 has one end connected to theadjustable fixed point 34, while its front end is connected to the upperarm 31 at the point 35, which is a litt-le distance above the` fulcrumpoint 32, whereby the tension of the spring is effectively applied atthe desired point. 36 designates a. link having its front end connectedto the upper portion of the arm 31, while its rear end is connected tothe hand lever 37, which is fulerumed at the point 38 upon the ratchetplate 39, whose teeth are engaged by the manually operated pawl 40. 41designates a link having its front end connected to the lever 3T and itsrear end connected to the arm 42 of the two way valve 43, in the fueldischarge pipe 44. 45 designates the fuel tank, which is mounted on therear of the beams 15. and provided with the suction pipe 46 having thevalve 47, therein, said suction pipe leading to the pump 48. The fueldischarge pipe 44, leads to the valve controlled burner 49` which isvpositioned at the rear end of the combustion chamber 26. 50 designatesthe blower conduit which leads from the blower 51, to the rear of thecombustion chamber 26, and conveys the necessary supply of air to theburner to promote com bustion. The fuel pump 48 is preferably a rotarypump of any conventional type and the Vblower 51 is also any standardblower and requires no further detailed description. The Vpump shaft 52and the blower shaft 53 may be driven by any suitable mechanism from thepower ta-ke off shaft 54 of the tractor, and in the present instance, lhave shown the power therefrom as being transmitted to the sprocketwheel 55 of the shaft 5G, by the sprocket chain 57. Power is transmittedfrom the shaft 56, by the chain 57", to the sprocket wheel 58 on theshaft 5i., From the shaft 5G, power is transmitted by the chain 59,wheel G0 and chain 61, to the sprocket wheel 62 on the blower shaft 53.It will be evident that other equivalent means for driving the pump andyblower from the power take off 54 may be employed, and that the fueltank, pump, and blower may be secured in position upon the frame 2 inother ways than that shown. The rear of the frame 2 may be secured uponthe rear axle` housings in any suitable manner, as by the yokes 63 andnuts 64 seen in Fig. 1.

The hooks 65 at the upper front portion of the frame 2, permit the upperends of the connections 29 to be attached thereto, wherebythe strainupon the hood operating connections is removed.

The operation is as follows Through the medium of the power transmissiondevices, driven from the power take off 54, the fuel pump 48 and theblower are operated in unison, and the hot gases and products ofcombustion are conveyed through the combustion chamber to the hood, andunder normal operating conditions, there is no smoke 01 fumes risingfrom the hood to a noticeable extent. VheD, however, the operatorreduces his speed, as is customary in shifting gears, as when theapparatus is moved from one location to another, the speed of the blowerdecreases and where the fuel supply is not checked, or controlled as inmy invention, there is liable to be an excess of smoke or unconsumedparticles of combustion issuing from the hood, when the latter israised. In my present device, when the operating lever 37 is pulledrearwardly, the arm 42 of the valve 43 is actuated to par# tially closesaid valve thereby diminishing the supply of fuel to the burner 49, sothat the proportions of the commingled air and fuel under theseconditions, will be such that a substantially perfect combustion takes fplace, and there will be no excess of smoke and fumes issuing from theraised hood. The fuel valve closing operation is entirely automatic,requires no attention on the part of the operator, and occurssimultaneously with the actuating of the lever 37 and the aising of thehood, Whose Weight is counterhalanced by the spring 33.

It will now be apparent that I have devised a novel and usefulconstruction of pavement heater which embodies the features of advantageenumerated as desirable in the staten'ient of the invention and theabove description and while I have in the present iistanoe shown anddescribed the preferred embodiments thereof 'which have been found inpractice to give satisfactory and reliable results, it is to beunderstood that the saine are susceptible of modification in variousparticulars Without departing from the spirit or scope of the inventionor sacrificing any of its advantages.

I-Iavinfr thus described my invention what I claim as new and desire tosecure by Letters Patent, is

1. In a pavement` heater, a combustion chamber and a hood therefor,means for actuating said hood, a fuel supply for said combustionchamber, and connections oominonto said hood actuating means and fuelsupply, whereby the latter is'autoinatically controlled simultaneouslywith the actuation ot said hood.

2. In a pavement heater, ay combustion chamber and a hood therefor,means for acnaat-ing said hood, a counterbalaneing spring having one endattached to said hood, actuating' means for counterbalanoing the Weightof said hood, a fuel supply for said combustion chamber, and connectionscommon to said hood actuating means and fuel supply, whereby the latteris automatically cont-rolled simultaneously with the actuation of saidhood.

3. In a pavement heater, a supporting fraine, a combustion chamber andhood oarried thereby, a burner in said combustion chamber, a fuel supplypipe for said burner, a valve in said fuel supply pipe, means forraising and lowering said hood, and a conneotion from said hoodactuating means to said valve. whereby thelatter is closed and openedduring actuation` of Said hood.

GEORGE A. COATS.

